JP5256657B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure.

2. Description of the Related Art Conventionally, a vehicle body front structure including a hood ridge having a closed cross-sectional structure extending in the front-rear direction from a front end portion of a front pillar to an upper side edge of an engine room is known (for example, Patent Document 1).
JP 2004-322762 A

  However, in the conventional vehicle body front structure described above, depending on the type of vehicle, for example, the impact of acting on the hood ridge in the axial direction at the time of a front collision of the vehicle, such as the cross section of the hood ridge is increased and the rigidity is increased for modeling reasons. The hood ridge may become difficult to deform with respect to the load. In such a case, since a relatively large load is transmitted from the hood ridge to the front pillar, it is necessary to increase the rigidity and strength of the front pillar, resulting in an increase in the weight of the vehicle. .

  Therefore, an object of the present invention is to obtain a vehicle body front part structure that can more reliably obtain an axial impact absorbing effect due to deformation of a hood ridge.

In the present invention, a front reinforcing section is provided by reinforcing a portion adjacent to the strut housing of the hood ridge with a reinforcing member, and an axial impact is provided between the front reinforcing section of the hood ridge and the front end of the front pillar. A deformation section to be deformed by a load is set, and in the deformation section, a deformation starting point portion is formed as a starting point of deformation by causing stress concentration by the applied impact load, and the hood ridge is disposed in substantially all the sections in the front-rear direction. The reinforcing member is accommodated and disposed in the closed cross section of the hood ridge. The reinforcing member includes a front reinforcing member and a rear reinforcing member, and the front reinforcing member has a flat plate shape. The closed wall of the hood ridge is closed by the shielding wall, and the rear reinforcing member is a flat plate-like shape extending from the inner side in the vehicle width direction to the outer side and the lower side. And the wall portion, and a pair of end wall portion disposed below the front and rear oblique wall portion, as the deformation starting portion, the bent portion where the side wall of the hood ridge is bent in the vehicle width direction In the front reinforcing section, the upper portion of the side wall in the vehicle width direction of the hood ridge is bulged inward in the vehicle width direction from the lower portion, and the portion near the rear end is directed rearward between the upper portion and the lower portion. A gradually reduced shelf is formed, the shelf is placed on the upper surface of the strut housing and joined, and the shelf is extended into the deformation section, and the bent portion is provided at the rear end of the shelf. It is the most important feature.

  According to the present invention, a deformation section having relatively low rigidity is set between the front reinforcing section and the front pillar front end, and the hood ridge is more reliably deformed from the deformation start point in the deformation section. Therefore, the impact absorbing effect in the axial direction due to the deformation of the hood ridge can be obtained more reliably.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a vehicle body front structure according to the present embodiment, and FIG. 2 is a perspective view showing the inside of a hood ridge of the vehicle body front structure. In each figure, FR indicates the front of the vehicle, IN indicates the inner side in the vehicle width direction, and UP indicates the upper side.

  As shown in FIG. 1, in the vehicle body front structure according to the present embodiment, an air box 2 having a closed cross-sectional structure is installed between a pair of front pillars 1 (shown only on one side in the figure) disposed on the left and right sides. Has been. A hood ridge 3 extends from the front end portion of the front pillar 1 toward the front from the vicinity of the air box mounting portion (substantially the same height position as the air box 2). That is, the hood ridge 3 extends substantially in the front-rear direction at the upper side edge of the engine room. A strut housing 4 is arranged adjacent to the inside in the vehicle width direction of the middle portion in the front-rear direction of the hood ridge 3.

  The food ridge 3 has a substantially rectangular closed cross-sectional structure and is appropriately reinforced by a plurality of reinforcing members 5A to 5E provided in the internal space.

  A front side member 6 extending in the front-rear direction is provided below the hood ridge 3 and on the inner side in the vehicle width direction. In FIG. 1, reference numeral 7 denotes an engine mount base.

  The hood ridge 3 has a hood ridge inner front portion 3A and a hood ridge inner rear portion 3B disposed on the inner side in the vehicle width direction, and a hood ridge outer 3C disposed on the outer side in the vehicle width direction. It is joined and integrated by such as. The hood ridge inner front portion 3A and the hood ridge inner rear portion 3B are substantially L-shaped members having side walls 3Aa, 3Ba and bottom walls 3Ab, 3Bb on the inner side in the vehicle width direction, and the hood ridge outer 3C is formed in the vehicle width direction. It is a member having a substantially L-shaped cross section having an outer side wall 3Ca and a top wall 3Cb. By joining them together by spot welding or the like, a substantially rectangular closed cross-sectional structure is formed over almost the entire section of the hood ridge 3 in the longitudinal direction. The cross section on the front end side of the hood ridge 3 is substantially closed by the end wall 3Cc of the hood ridge outer 3C.

  In addition, as shown in FIG. 2, the section adjacent to the strut housing 4 in the side walls 3Aa and 3Ba of the hood ridge inner front part 3A and the hood ridge inner rear part 3B is placed on the upper surface 4a of the strut housing 4. Shelves 10 (10a, 10b) to be joined are formed. The shelf 10 has a flat strip between the upper portions 11a and 11b and the lower portion by causing the upper portions 11a and 11b to bulge inward in the vehicle width direction from the lower portion of the intermediate portions in the vertical direction of the side walls 3Aa and 3Ba. It is formed as a wall part.

  By the way, in this embodiment, the width | variety of this shelf part 10 is decreasing gradually toward the back from the middle of the food ridge inner rear part 3B. In other words, the side wall 3Aa of the hood ridge inner front portion 3A is provided with a belt-like shelf portion 10a having a substantially constant width, and the side wall 3Ba of the hood ridge inner rear portion 3B is provided with a belt-like front side having the same constant width as the shelf portion 10a. A shelf portion 10b1 and a substantially triangular rear shelf portion 10b2 having the rear side as a vertex P in plan view are provided.

  As the shelf 10 is formed, the upper portion 11b of the side wall 3Ba of the hood ridge inner rear portion 3B is bent in a substantially crank shape inward and outward in the vehicle width direction. That is, the bent portion 12a appears above the boundary between the front shelf portion 10b1 and the rear shelf portion 10b2, and the bent portion 12b appears above the rear end portion of the rear shelf portion 10b2.

  Here, in the present embodiment, two reinforcing members 5 </ b> A and 5 </ b> B are provided at positions adjacent to the strut housing 4 in the cavity of the hood ridge 3.

  Among these, the reinforcing member 5A located on the front side includes a substantially rectangular flat plate-shaped shielding wall portion 5Aa. The shielding wall 5Aa closes almost the entire area of the closed section of the hood ridge 3.

  On the other hand, the reinforcing member 5B located on the rear side is disposed outside the strut housing 4 in the vehicle width direction and straddling the boundary portion between the hood ridge inner front portion 3A and the hood ridge inner rear portion 3B.

  As shown in FIG. 2, the reinforcing member 5B has a flat plate-like inclined wall portion 5Bb extending from the inner side in the vehicle width direction and from the upper side to the outer side and the lower side. A pair of substantially triangular end wall portions 5Ba and 5Ba are provided on the lower side.

  A ceiling wall 5Bc is connected to the inclined wall portion 5Bb, and the ceiling wall 5Bc is placed on the shelf portion 10 (10a, 10b1) and joined by spot welding or the like.

  Thus, in this embodiment, the shelf 10 is formed on the side walls 3Aa, 3Ba on the inner side in the vehicle width direction of the hood ridge 3, and this shelf 10 is placed on the upper surface of the strut housing 4 and further reinforced on the shelf 10. By mounting the top wall 5Bc of the member 5B and joining them, the vertical rigidity of the hood ridge 3 with respect to the vertical load input to the strut housing 4 is effectively enhanced.

  Further, the reinforcing member 5B enhances the connection rigidity between the hood ridge inner front portion 3A and the hood ridge inner rear portion 3B, and the axial direction inputted to the hood ridge 3 in the portion where the reinforcing members 5A and 5B are provided. The rigidity against the load is also increased.

  In the present embodiment, three reinforcing members 5C, 5D, and 5E are provided in the rear end portion in the cavity of the hood ridge 3, that is, in the vicinity of the front end portion of the front pillar 1.

  Among these members, the reinforcing member 5C includes a substantially rectangular flat plate-shaped shielding wall portion 5Ca. The shielding wall 5Aa closes almost the entire area of the closed section of the hood ridge 3. The reinforcing member 5 </ b> C, together with the reinforcing member 5 </ b> A disposed on the front side, suppresses air from passing back and forth through the internal space of the hood ridge 3.

  A reinforcing member 5D is provided on the reinforcing member 5C so as to form a substantially T shape with the reinforcing member 5C. The reinforcing member 5D includes a top wall 5Da along the top wall 3Cb of the hood ridge outer 3C, and a relatively low side wall portion 5Db that is erected downward from the outer edge in the vehicle width direction of the top wall 5Da. ing. The top wall 5Da has a recess 5Dc corresponding to the recess 3Ce (see FIG. 1) extending in the vehicle width direction formed on the top wall 3Cb of the hood ridge outer 3C. The reinforcing member 5D also functions as a bracket (or a reinforcing member for the bracket) for attaching a hood hinge (not shown).

  And the reinforcement member 5E is provided so that it may overlap under this reinforcement member 5D. The reinforcing member 5E is provided corresponding to the end of the air box 2 in the vehicle width direction.

  These reinforcing members 5C, 5D, and 5E (particularly 5C and 5D) have an effect of increasing the rigidity of the hood ridge 3 with respect to a vertical load input via an engine hood (not shown) and a hood hinge. doing. Moreover, the rigidity with respect to the axial load input to the hood ridge 3 is enhanced by the reinforcing members 5C, 5D, and 5E.

  3A and 3B are side views of the vehicle body front structure according to the present embodiment, in which FIG. 3A is a diagram illustrating a state in which the hood ridge is deformed due to an axial load (a load from the front) during normal operation. It is.

  As shown in FIG. 3, in the vehicle body front structure according to the present embodiment, a front side reinforcing section is formed by reinforcing a portion adjacent to the strut housing (see FIGS. 1 and 2) of the hood ridge 3 with reinforcing members 5 </ b> A and 5 </ b> B. B is provided.

  And by providing this front side reinforcement section B, a deformation section C having a relatively low axial rigidity is set between the front end portion A of the front pillar 1, and further, an action is provided in the deformation section C. A deformation starting point D is set as a starting point of deformation by causing stress concentration by the applied impact load.

  In the present embodiment, bent portions 12a and 12b that are bent in the vehicle width direction are provided as the deformation starting point D on the side wall 3Ba of the hood ridge inner rear portion 3B. These two bent portions 12a and 12b are both portions where stress concentrates with respect to the axial load. However, as shown in FIG. 2, the portion where the front bent portion 12 a is formed has higher rigidity than the rear bent portion 12 b due to the wider width of the shelf portion 10 b, and in this embodiment, The rear bent portion 12b corresponding to the apex P of the triangular rear shelf 10b2 (that is, the rear end where the width of the shelf 10 is 0) is the deformation starting point D.

  Further, in the present embodiment, as described above, the rear reinforcing section E reinforced by the reinforcing members 5C, 5D, and 5E (see FIGS. 1 and 2) is provided at the rear of the deforming section C, and the deformation starting point D is provided. The front end of the rear reinforcing section E is set. By doing so, the rigidity with respect to the axial load at the deformation starting point D can be suddenly changed in the front-rear direction, and the stress concentration at the deformation starting point D and thus the start of deformation can be promoted. The reinforcement in the rear reinforcement section E is not intended for the rear reinforcement section E to be stretched against the axial load, but to the extent that a sudden change in rigidity is obtained with the deformation starting point D as a boundary. Keep it as

  In this embodiment, as shown in FIGS. 1 and 2, two elongated through holes 3 </ b> Cd that are vertically long are arranged at the rear end of the side wall 3 </ b> Ca of the hood ridge outer 3 </ b> C. When assembled, the through hole 3Cd is arranged at the front end A of the front pillar 1. With this configuration, the portion where the through hole 3Cd is formed becomes the hood ridge outer 3C, that is, the fragile portion of the hood ridge 3.

  Further, the section ahead of the front reinforcement section B of the hood ridge 3 is set as a deformation section G having relatively low rigidity.

  In the above configuration, when an impact load F acts from the front of the vehicle at the time of a vehicle frontal collision or the like, as shown in FIG. 3 (b), the deformation sections G and C are located before and after the front reinforcing section B. Shock can be absorbed by deformation.

  Here, in this embodiment, since the deformation starting point portion D is provided in the deformation section C, the deformation section C is more reliably deformed starting from the deformation starting point portion D, and the shaft by the deformation of the hood ridge 3 is obtained. The impact absorbing effect in the direction can be obtained more reliably. In addition, the impact absorption effect can be enhanced as compared with the case where only the deformation section G is deformed.

  Further, according to the present embodiment, as the deformation starting point D, the bent portion 12b in which the side wall 3Ba of the hood ridge 3 is bent in the vehicle width direction is provided, so that the comparison can be made without reducing the vertical rigidity. As a simple configuration, the deformation starting point D can be set.

  In the present embodiment, in the front side reinforcing section B, the upper portions 11a and 11b of the side wall 3Ba on the inner side in the vehicle width direction of the hood ridge 3 are bulged from the lower side to the inner side in the vehicle width direction. A shelf 10 is formed therebetween, and the shelf 10 is placed on and joined to the upper surface 4 a of the strut housing 4. And this shelf part 10 is extended in the deformation area C, and the bending part 12b is provided in the rear end of the said shelf part 10. FIG. For this reason, the shelf portion 10 can surely transmit the vertical load input from the strut housing 4 to the hood ridge 3 and the rear end of the shelf portion 10 as the shelf portion 10 bulges on the side wall 3Ba. Can be used as the deformation starting point D. That is, according to the present embodiment, the improvement in the support rigidity of the vertical load from the strut housing 4 and the improvement in the shock absorption in the axial direction of the hood ridge 3 are easily made compatible by setting the shelf portion 10. be able to.

  Further, by gradually reducing the width of the shelf 10 toward the rear end, a sudden change in shape is prevented, and the hood ridge inner rear portion 3B (especially the shelf 10) is more molded (press molded). There is an advantage that it can be easily and more reliably performed.

  Furthermore, in the present embodiment, the rear reinforcement section E reinforced by the reinforcing members 5C, 5D, and 5E is provided at the rear part in the deformation section C, and the deformation starting point D is provided at the front end of the rear reinforcement section E. In the deformation section C, the rigidity with respect to the axial load can be suddenly changed in the front-rear direction with the deformation start point D as a boundary, and the stress concentration at the deformation start point D and thus the start of deformation can be promoted.

  Furthermore, in the present embodiment, since the fragile portion is formed by providing the through holes 3Cd and 3Cd at the rear end portion of the rear side reinforcing section E, the rear side reinforcing section E is also shown in FIG. As shown in b), it can be easily deformed as a whole, and accordingly, the effect of absorbing the axial load due to the deformation of the hood ridge 3 can be obtained more reliably.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, the deformation starting point portion may have a configuration other than the bent portion as long as the required rigidity with respect to the load and moment in the vertical direction can be secured. For example, the side wall of the hood ridge may be partially thinned, You may set by forming.

  Moreover, you may set the weak part provided in the rear-end part of the rear side reinforcement area by thinning or providing the through-hole of another shape.

It is a disassembled perspective view of the vehicle body front part structure concerning embodiment of this invention. It is a perspective view which shows the internal structure of the hood ridge of the vehicle body front part structure concerning embodiment of this invention. It is a side view of the vehicle body front part structure concerning embodiment of this invention, Comprising: (a) is normal time, (b) is a figure which shows the state which deform | transformed the hood ridge by the axial load.

Explanation of symbols

1 Front pillar 3 Hood ridge 3Bb Side wall 3Cd Through hole (fragile part)
4 Strut housing 5A, 5B, 5C, 5D, 5E Reinforcing member 10 Shelves 12b Bending part A Front pillar front end B Front reinforcement section C Deformation section D Deformation start section E Rear reinforcement section

Claims (3)

In the vehicle body front structure with a hood ridge extending in the front-rear direction from the front end of the front pillar to the upper side edge of the engine room,
While providing a front reinforcing section by reinforcing a portion adjacent to the strut housing of the hood ridge with a reinforcing member,
A deformation section that is deformed by an impact load in the axial direction is set between the front reinforcing section of the hood ridge and the front end of the front pillar,
In the deformation section, a deformation starting point portion is provided as a starting point of deformation by causing stress concentration by the applied impact load,
The hood ridge is formed in a closed cross-sectional structure over substantially the entire section in the front-rear direction,
The reinforcing member is housed and disposed within a closed cross section of the hood ridge, and includes a front reinforcing member and a rear reinforcing member,
The front reinforcing member has a flat shielding wall portion, and the closed cross section of the hood ridge is closed by the shielding wall portion, and the rear reinforcing member is located on the inner side in the vehicle width direction and from the upper side to the outer side and the lower side. A flat inclined wall portion extending toward the front and a pair of end wall portions disposed on the lower side of the front and rear of the inclined wall portion ,
As the deformation starting point, a bent portion is formed by bending the side wall of the hood ridge in the vehicle width direction,
In the front reinforcing section, a shelf in which the upper part of the side wall on the inner side in the vehicle width direction of the hood ridge bulges inward in the vehicle width direction from the lower part, and the portion near the rear end gradually decreases rearward between the upper part and the lower part. Forming the part and mounting the shelf on the upper surface of the strut housing,
A vehicle body front part structure in which the shelf is extended into the deformation section and the bent portion is provided at a rear end of the shelf .   The vehicle body front portion according to claim 1, wherein a rear side reinforcing section reinforced with a reinforcing member is provided at a rear portion in the deformation section, and the deformation starting portion is provided at a front end portion of the rear side reinforcing section. Construction. The vehicle body front portion structure according to claim 2 , wherein a weak portion is provided at a rear end portion of the rear reinforcing section.

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